Magnetic lamp holder



- Feb. 17., 1925. l 1,526,464

v O.C.DENhUS 4 MAGNETIC LAMP HOLDER Filed June 18, 1921 Patented Feb. 17,v 1925.

UNITED STATES OLIVER C. DENNIS, OF WILMETTE, ILLINOIS.

MAGNETIC LAMP HOLDER.

Application led June 18,

To all whom t may concern:

Be it known that I, OLIVER. C. DENNIS, a citizen of the United States, and a resident of Wilmette, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Magnetic Lamp Holders, of which the following is a full, clear, and exact description.

The invention relates to magnetic lampholders.

The object of the invention is to provide a magnetic holder for an electric lamp, which is simple in construction, eflicient in operation and can be produced at a low cost.;

vvThe invention consists in the several novel features hereinafter set forth and more particularly defined by claimsat the conclusion hereof.

In the drawings: Fig. 1 is asection of a lamp-holder embodying the invention. Fig. 2 is a perspective of the casing. Fig. 3 is a perspective of the magnet and the switchmember mounted thereon.

The invention is exemplified in a device comprising a cup-shaped casing 4, containing a holding magnet comprising an iron` core 5, a helix 6, an inner magnetic lhead 7 and an outer non-magnetic head 8. A screw 9 is integrally formed with the core 5, extends through the inner end7 of the magnet and is threaded to a circular block 10 of insulating material. A spring switch-member 11 is secured on the upper face of the insulating block and an insulating-washer 9 isinterposed between head 7 and blockl 10 to prevent the connections, which secure the switch-member 11 to the block, from contacting with said head. -A flexible cord 12,- which is provided at one end with a plug 13, which is adapted to be inserted in an ordinary lamp-socket, comprises a conductor 14 which is electrically connected 'to the resilient switch-member l1, and a conductor 15l which is electricall lconnected to the casing 4. One end of elix 6 is connected to the switch-member 11 and the other to the casing 4. The upper end of the casing 4 is turned inwardly, as at 16, and anged, as at 17 to form a socket adapted to receive the base 18 of an incandescent lamp 19. This base is provided with projecting studs 20 which are adapted to pass through notches 21 in the constricted anved portion 17 of thecasing and to be helsd in the perforations 22 when the studs are turned,

1921. Serial No. 478,761.

after they have been inserted into the casing and placed into position to pass into said holes. The spring switch-member 11 engages the tip-contact 23 of the lamp and also presses the entire lamp outwardly to cause the studs 20 to be locked in the openings 22. The lamp-base 18 is connected to one terminal of the lamp-filament and the tipcontact 23 to the other, as well understood in the art. The magnet 7 is spaced from the flange or constricted portion of the casing and is secured therein against relative longitudinal movement by indenting the case, as at 24, to secure the inner magnet end 7.

When the current is supplied to the conductors, the circuit for the lamp will be as follows: 'Conductor 14, switch-member 11, tip-contact 23, the lamp filament, lamp-base 18,- studs 20, casing 4, and conductor 15. At the same time, a circuit will be established for the operation of the magnet from conductor 14 through member 11 and helix 6 andl casing 4 to conductor 15. The magnetic flow will be through the core 5, magnet-head 7, the lower portion of the casing 4 and the magnetic part on which the magnet will be held.

The invention exemplifies a device which is simple in construction, in which the necessity of insulating the lamp from the casing is avoided, and in which the casing vis utilized as a part of the lamp-circuit and as a part of the path for the magnetic ux. The invention also exemplifies a magnetic lamp holder in which a metallic one-piece -shell serves as a casing for holding an incandescent lamp and enclosing the holding magnet and the contact means for the lamp. The invention is not to be understood as restricted to the details set forth, since these may be modified within the scope of the appended claims, without departing from the spirit and scope of the invention.

Having thus described the invention, what I claim as new and desire to secure by Letl ters Patent, is:

1.111 a portable electric lamp, the combinationA of a casing, an electromagnet comprising a helix disposed within and adjacent one end of the casing, the latter forming a part of the magnetic path forysaid magnet, a amp having a. base adapted to make electrical contact with and' to fit into'the other end of the casing, contact means in the casingbetweenthe magnet anda-'the lamp for s casing.

making electrical connections with the lamp,

an electrical. conductor connected to the casing, and a conductor connected to the contact and to one end of the helix, the other end of thc helix l being lconnected to the 2. In a portable electric lamp, the combin'ation of a one-piece shell provided at one end with an integral inturnedportion ha'ving integral means -to directly interlock with and removably hold a lamp base, a lamp having a basel provided with mcans to-interlock with said means o n the shell, an electromagnet comprising a helix and a head fitting within and contacting with an integral portion'oi:` the shell adjacent the inner end of the helix, a Contactin the shell mounted on and insulated from the magnet and adapted to engage a contacton the lamp base, and conductors for supplying current to the contact and the helix, the portion of the shell containing the magnet and said head forming a portion of the path .for the magnetic the means on saidl flange, an electro-magnet comprising a helix and a head fitting Within and contacting with an integral portion of the shell adjacent the inner end of the helix, a contact in the shell mounted on and insulated from the magnet and adapted to 4. In a portable electric lamp, the come bination of a one-piece shell provided at one end with ,an integral inturned portion and an'integral longitudinally extending flange provided with notches, a lamp having a base provided with means to enter said notches and interlock 4with the flange to removably hold the lamp in the shell, an electro-magnet comprising a helix and a head fitting Within and contacting with an integral portion of' ,the shell adjacent the inner end o the helix, acontact in the shell mounted lon and insulated from the magnet and adapted to engage a Contact on the lamp base, and conductors for supplying current to the contact and the helix, the portion of the shell containing the magnet andthe head forming a portion of the path for the magnetic flux.

oLIvER o. DENNIS. 

